Bluebutton Jellyfish

On Sunday March 13th, the afternoon was hot and sunny with no waves so we decided to go float with our pool noodles to cool off in the ocean.  As we approached the water, we were warned by other gringos not to go in as there was a large number of small blue jellyfish-like creatures in the water and we might get stung.  We noticed many of these creatures up on the beach.  They were only about an inch in size.

After doing research we found out they do not sting but can cause skin irritation.

Blue Button Jellyfish

Here's a link to more info:
http://answers.yahoo.com/question/index?qid=20080610120556AAEYho7